Hello,
It’s likely that the notification mechanism did not work.
Please check the relevant article here: https://www.dashed-slug.net/howto-debug-an-incoming-deposit-full-node-wallet/
Normally, with Bitcoin core-like wallets (like the Litecoin core wallet), you can specify a command that runs every time a transaction is observed on the network. This command can be a curl command. This is why the plugin recommends that you have in your .conf file something like:
walletnotify=curl -k https://www.example.com/?__wallets_apiversion=3&__wallets_action=notify&__wallets_symbol=LTC&__wallets_notify_type=wallet&__wallets_notify_message=%s
The %s string is replaced with the TXID, so that the plugin can then request info on that transaction.
Check to see that the curl command succeeds. Usual culprits are your .htaccess file, firewalls, errors on the wallet server (such as curl not installed), etc.
Hope this helps. If it doesn’t let me know.
with regards